GNU Radio 2.x: gr_rotator.h Source File

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# gr_rotator.h

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    00001 /* -*- c++ -*- */
    00002 /*
    00003  * Copyright 2003 Free Software Foundation, Inc.
    00004  *
    00005  * This file is part of GNU Radio
    00006  *
    00007  * GNU Radio is free software; you can redistribute it and/or modify
    00008  * it under the terms of the GNU General Public License as published by
    00009  * the Free Software Foundation; either version 2, or (at your option)
    00010  * any later version.
    00011  *
    00012  * GNU Radio is distributed in the hope that it will be useful,
    00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015  * GNU General Public License for more details.
    00016  *
    00017  * You should have received a copy of the GNU General Public License
    00018  * along with GNU Radio; see the file COPYING.  If not, write to
    00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00020  * Boston, MA 02111-1307, USA.
    00021  */
    00022
    00023 #ifndef _GR_ROTATOR_H_
    00024 #define _GR_ROTATOR_H_
    00025
    00026 #include <gr_complex.h>
    00027
    00028 class gr_rotator {
    00029   gr_complex    d_phase;
    00030   gr_complex    d_phase_incr;
    00031
    00032  public:
    00033   gr_rotator () : d_phase (1), d_phase_incr (0) { }
    00034
    00035   void set_phase (gr_complex phase)     { d_phase = phase; }
    00036   void set_phase_incr (gr_complex incr) { d_phase_incr = incr; }
    00037
    00038   gr_complex rotate (gr_complex in){
    00039     d_phase *= d_phase_incr;    // incr our phase (complex mult == add phases)
    00040
    00041     d_phase /= abs(d_phase);    // ensure multiplication is rotation
    00042                                 // FIXME.  This is expensive.  Maybe workaround using
    00043                                 // double precision complex???
    00044
    00045     return in * d_phase;        // rotate in by phase
    00046   }
    00047
    00048 };
    00049
    00050 #endif /* _GR_ROTATOR_H_ */